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Mass transfer characteristics of H2S absorption from gaseous mixture into methyldiethanolamine solut.pdf

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Mass transfer characteristics of H2S absorption from gaseous mixture into methyldiethanolamine solut

M m H a b a A R R A K A M M P I 1 s b u s m p a t i a d a k c t c p l i 1 dSeparation and Purification Technology 72 (2010) 326–334 Contents lists available at ScienceDirect Separation and Purification Technology journa l homepage: www.e lsev ier .com/ locate /seppur ass transfer characteristics of H2S absorption from gaseous mixture into ethyldiethanolamine solution in a T-junction microchannel ongjiu Sua,b, Shudong Wangb,?, Haining Niub, Liwei Panb, Anjie Wanga, Yongkang Hua State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, PR China Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China r t i c l e i n f o rticle history: eceived 27 November 2009 eceived in revised form 26 February 2010 ccepted 26 February 2010 eywords: bsorption a b s t r a c t In this work, the mass transfer characteristics of absorption of H2S (1200ppmv) into 40wt% methyldiethanolamine (MDEA) solution have been investigated experimentally in a horizontal cross- flow T-junction microchannel with a diameter of 1.00mm. The interfacial area was determined by the absorption of CO2 into NaOH solution. It was found that the high removal efficiency of H2S (up to 99.5%) was achieved in themicrochannel. Mass transfer resistance existedmainly on the gas side in this absorp- tion process. It was shown that the gas side volumetric mass transfer coefficient and interfacial area 3 2 3 icroreactor ass transfer rocess intensification nterfacial area were as high as 31,746mol/(m satm) and 11,100m /m , respectively. In addition, a comparison ofmass transfer performance among different gas–liquid contactors was performed. It was revealed that the T- junctionmicrochannel in this study could provide at least one or two orders ofmagnitude higher gas side volumetric mass transfer coefficient than others. However, the intensification of mass transfer process was mainly ascribed to the enhancement of interfacial area rather than the gas side mass